ep1s25 Altera Corporation, ep1s25 Datasheet - Page 123

• Manufacturer Part Number: ep1s25
• Description: Stratix Device Family Data Sheet
• Manufacturer: Altera Corporation

Figure 2–63. Control Signal Selection per IOE
Altera Corporation
July 2005
Dedicated I/O
Clock [7..0]
I/O Interconnect
[15..0]
Local
Interconnect
Local
Interconnect
Local
Interconnect
Local
Interconnect
Local
Interconnect
io_coe
io_cclr
io_cce_out
io_cce_in
io_cclk
Each IOE contains its own control signal selection for the following
control signals: oe, ce_in, ce_out, aclr/preset, sclr/preset,
clk_in, and clk_out.
selection.
In normal bidirectional operation, the input register can be used for input
data requiring fast setup times. The input register can have its own clock
input and clock enable separate from the OE and output registers. The
output register can be used for data requiring fast clock-to-output
performance. The OE register can be used for fast clock-to-output enable
timing. The OE and output register share the same clock source and the
same clock enable source from local interconnect in the associated LAB,
dedicated I/O clocks, and the column and row interconnects.
shows the IOE in bidirectional configuration.
clk_in
clk_out
io_bclk[3..0]
Figure 2–63
ce_in
ce_out
io_bce[3..0]
illustrates the control signal
aclr/preset
Stratix Device Handbook, Volume 1
sclr/preset
io_bclr[3..0]
Stratix Architecture
oe
Figure 2–64
io_boe[3..0]
2–109